Enamel Erosion: Gradual loss of enamel due to acidic foods and beverages, gastric reflux, or aggressive brushing can expose the dentin.

Gum Recession: Receding gums expose the roots of the teeth, which are not covered by enamel and are more sensitive to external stimuli.

Tooth Decay: Cavities or dental caries can lead to the breakdown of enamel and dentin, causing sensitivity.

Grinding or Clenching: Bruxism, the habit of grinding or clenching teeth, can wear down enamel and contribute to tooth sensitivity.